If two users are coming simultaneously then, they will be using the same object from ACTION HASHMAP and if "perform" is called then the same object "perform" method will be called. I do see that request and response object will be unique for each request in "doPost()". But keeping in mind that Servlet is not thread safe then one request, response object will overwrite the other persons request response object.

Can anybody explain that my understanding is correct and if 10s of request will come simultaneously then each will perform uniquely or not ???